Shadow Grey vs Iron Wolf

How close are they?

ΔE 8.1, close: similar, with a visible difference side by side. Iron Wolf is a little darker, more muted than Shadow Grey.

Can I use Iron Wolf instead of Shadow Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Iron Wolf is a little darker, more muted than Shadow Grey.

Can I use Shadow Grey instead of Iron Wolf?

The same difference applies the other way round: Shadow Grey is a little lighter, more saturated.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.